if there is no sdcch assignment and there is no sdcch congestion, then i would suspect a software problem…
let’s check qos stats:
1/ are there SDCCH assigments in the cell?
2/ what is the main cause of sdcch rejection ?
3/ what is the mean holding time of a sdcch channel?
4/ what is the state of your TCH Queuing? (are there MS queued?)
could you get an immediate assignment with another MS in this cell ?
and with this TEMS MS in another cell ?
in your cell, there is the feature multiple CCCH activated. I don’t know if that can cause such problem, but it’s worth investigating.